1. Lineage Cell Therapeutics, Inc., Alameda, California, USA.
2. Stem Cell Research Center, University of California, Irvine, Irvine, California, USA.
3. Department of Physical Medicine & Rehabilitation, University of California, Irvine, Irvine, California, USA.
4. Department of Ophthalmology, University of California, Irvine, Irvine, California, USA.
5. Department of Anatomy & Neurobiology, University of California, Irvine, Irvine, California, USA.
6. Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, USA.